* Henry C. Pitz: Pitz illustrated the first 14 books in the series, published between 1924 and 1940. His style is characterized by detailed line drawings that capture the charm and simplicity of the original books.
* Paul Galdone: Galdone took over illustrating the series in 1964 and continued for many years. His illustrations are known for their bright colors and playful style.
* Sal Murdocca: Murdocca has been illustrating the Boxcar Children Mysteries since 1991. His style is a blend of traditional and contemporary, with a focus on capturing the characters' personalities and expressions.
Therefore, there isn't a single illustrator for the entire series, but rather a group of artists whose work has contributed to the visual identity of the Boxcar Children Mysteries.